Convert Milligram to Troy Ounce
Convert milligrams to troy ounces instantly. 1 milligram = 3.215075e-5 troy ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Troy Ounce to Milligram converter for the reverse conversion.
Units explained
Milligram
A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.
From the SI prefix 'milli-' (from Latin 'mille', thousand).
Standard for medicine dosing, nutrition labels, and fine jewelry.
Part of the original metric system of 1795.
Troy Ounce
The troy ounce (ozt) equals about 31.103 grams, one-twelfth of a troy pound.
From the Troy system of weights associated with Troyes, France.
The global standard for pricing gold, silver, platinum, and palladium.
Established in the medieval Troy system and retained for precious metals.
Milligram to Troy Ounce conversion formula
The relationship between milligrams and troy ounces:
To convert milligrams to troy ounces, multiply the value in milligrams by 3.215075e-5. To reverse, multiply troy ounces by 31103.4768.
How to use this converter
Type a value into the calculator. The result in troy ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Troy Ounce to Milligram converter for the reverse direction.
Step-by-step: convert milligrams to troy ounces
- Write down the value in milligrams (mg).
- Multiply that value by the factor 3.215075e-5.
- The product is the equivalent value in troy ounces (oz t).
- To reverse, multiply the troy ounce value by 31103.4768.
Worked examples
Example 1 — Convert 1 mg to oz t:
1 × 3.215075e-5 = 3.215075e-5 oz t
Example 2 — Convert 100 mg to oz t:
100 × 3.215075e-5 = 0.0032150747 oz t
Real-world example — Packaging gauge
A 4-milligram plastic bag thickness is a common spec for grocery and freezer bags. Converting from milligrams to troy ounces is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 mg × 3.215075e-5 = 0.000128603 oz t
Real-world example — Plastic film and laminate thickness
A 500-milligram sheet is a typical spec for ID-card laminates and film overlays. Converting to troy ounces aligns the value with the unit most CAD systems and material datasheets prefer.
500 mg × 3.215075e-5 = 0.0160753733 oz t
Milligram to Troy Ounce conversion table
Standard reference values for converting milligrams to troy ounces:
| Milligram [mg] | Troy Ounce [oz t] |
|---|---|
| 0.01 | 3.215075e-7 |
| 0.1 | 3.215075e-6 |
| 1 | 3.215075e-5 |
| 2 | 6.430149e-5 |
| 3 | 9.645224e-5 |
| 4 | 0.000128603 |
| 5 | 0.0001607537 |
| 10 | 0.0003215075 |
| 20 | 0.0006430149 |
| 30 | 0.0009645224 |
| 40 | 0.0012860299 |
| 50 | 0.0016075373 |
| 100 | 0.0032150747 |
| 500 | 0.0160753733 |
| 1000 | 0.0321507466 |
Frequently asked questions
How many troy ounces is 1 milligram?
How do I convert milligrams to troy ounces?
How do I convert troy ounces back to milligrams?
How many troy ounces is 100 milligrams?
Popular weight unit conversions
Convert Milligram to other weight units
Show all Milligram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 mg = 3.215075e-5 oz t) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.